______,until completely dissolved.,Stir in cold water.,Refrigerate 1 hour or until slightly thickened (consistency of unbeaten egg whites).,Gently stir in applesauce.,Pour into 4-1/2-cup ring mold sprayed with cooking spray.,Refrigerate 4 hours or until firm.,Meanwhile, mix apples, marshmallows, celery, walnuts and dressing.,Refrigerate until ready to serve.,Unmold gelatin onto serving plate; surround with lettuce.,Fill center with apple mixture.,Store leftover gelatin mold in refrigerator.